With the use of frozen embryos, one retrieval can cover multiple cycles. Repeated fresh embryo transfers require repeat egg retrievals and this can increase the risk of negative side affects related to stimulation of the ovaries. “Cycles using frozen embryos usually are less expensive and less invasive than cycles using fresh embryos.”Īdditionally, using frozen embryos can reduce the strain on a woman’s body in the event of repeated cycles. However, costs may vary from clinic to clinic. Typically, the cost difference between fresh embryo transfer and FET is significant, with FET being much cheaper, but this is because a great deal of the “work” has already been done with FET in a previous cycle (egg harvesting, insemination, development of embryos, etc.). Other Advantages of Frozen Embryo Transferīecause of the different success rates clinic to clinic, it is also important to consider other advantages of fresh vs. However, it is important to note the difference is minor. The data shows FET healthy live birth rates were consistently higher for each age group. The latest available data from a CDC 2013 report indicates that, nationally, the percentage of fresh embryo transfers resulting in a term, normal weight, singleton live birth for women under 35 was 28.2%, while the percentage of frozen embryo transfers resulting in a live birth for the same age group was 28.6%. In this case, the clinic may be using embryos it considers lower quality for subsequent frozen embryo transfers. Many clinics start with a fresh embryo transfer, selecting the best quality embryo to use, and then freezing the rest. When you compare success rates, it is also very important to understand the process an IVF clinic goes through in freezing embryos. Success rates for the different procedures differs seriously from clinic to clinic, and can be impacted by things like the age of the patient and the use of donor eggs. Frozen Embryo Transfer Success RatesĪ large-scale meta-analysis done in 2011 of several studies suggests that FET is more successful in producing ongoing pregnancies than fresh embryo transfer. This is backed up by more recent large-scale studies, which produced similar results ( 1, 2). The frozen embryo transfer (FET) process involves taking embryos which have been cryopreserved (frozen) previously and placing them into the uterus.
What is fresh embryo transfer?ĭuring fresh embryo transfer, one or more recently developed embryos from the current cycle of IVF are transferred into the uterus as soon as they are ready – often 3 to 6 days after egg retrieval. Eventually, one or more of these embryos will be placed inside the uterus – a process called embryo transfer. These fertilized eggs are then allowed to develop into embryos. The success rates of frozen and fresh embryo transfer are similar when it comes to producing pregnancy in women under 35, and recent large scale studies indicate that FET may result in more favorable outcomes.ĭuring any IVF (in vitro fertilization) procedure, eggs and sperm are combined external to a woman’s body.
The transfer of frozen embryos is called FET (frozen embryo transfer). During a cycle of IVF, an embryo will be transferred into a woman’s uterus.
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